A weekly listing of garden events, classes and sales.

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Dates and times are subject to change. Call ahead to confirm.

Oct. 20-22

Classes

Dried flower art

SAT Turn dried flowers and other plant materials into a work of art, 1-4 p.m., South Seattle Community College, 6000 16th Ave. S.W., Seattle; $45 (206-764-5339 or www.learatsouth.org).

Northwest Perennial Alliance

SAT Inviting gardeners of all levels for some hands-on experience with perennials, 11 a.m.-3 p.m., Bellevue Botanical Garden, 12001 Main St., Bellevue; free (206-354-7010).

Master Gardener talk: dahlias

SAT King County Master Gardener Foundation Talk series welcomes Ralph Dines, discussing dahlias, 10:30 a.m., Master Gardener Demonstration Garden, 15500 S.E. 16th St., Bellevue; free (206-205-3122).

Dwarf conifers

SAT Expand your garden palette with small- to medium-growing needled evergreens to enhance every garden with their wide range of forms and foliage colors, 11 a.m., Emery’s Garden, 2829 164th St. S.W., Lynnwood; free (425-743-4555 or www.emerysgarden.com).

“Fall into Winter”

SAT Carrie Becker, local plant expert and co-creator of the Bellevue Botanical Garden Perennial Border, talks on shrubs and perennials that will provide fall and winter interest in the garden, 11 a.m., Swansons Nursery, 9701 15th Ave. N.W., Seattle; free (206-782-2543, ext. 238, or www.swansonsnursery.com).

Backyard invasions

SAT Learn how invasive and noxious weeds spread, where they come from, and what communities can do to stop them from spreading any further, 1:30-3 p.m., Northgate Community Center, 10510 Fifth Ave. N.E., Seattle; free (registration: 206-386-4283).

Putting the garden to bed

SUN Learn inexpensive ways to replenish the soil and prepare for next spring, 11 a.m.-12:30 p.m., Bradner Gardens Park, 29th Ave. S. and S. Grand St., Seattle; $15-$18 (registration: www.seattletilth.org.)

Heaths and heathers

SUN Learn how to select and grow these plants for virtual year-round color accents, 1 p.m., Emery’s Garden, 2829 164th St. S.W., Lynnwood; free (425-743-4555 or www.emerysgarden.com).

Tours

Fall colors in the garden walk

SAT Educational and recreational walk through LaConner Flats with examples of great plant design and fall color, 1-2 p.m., Christianson’s Nursery and Greenhouse, 15806 Best Road, Mount Vernon; free (800-585-8200 or www.christiansonsnursery.com).

Garden calendar items can be faxed, 206-464-2239; mailed to Garden Calendar, Seattle Times, P.O. Box 70, Seattle, WA 98111; or e-mailed to gardencalendar@seattletimes.com. The deadline is three weeks before publication.